Coronal loop oscillations observed by EIS"

EIS sit-and-stare observations of an active region on 2007-07-09 are analysed.
After standard preparation of the data, coronal loop oscillations are observed
in the spectral line Doppler shifts. A period of 220s and 290s and an amplitude
less than 1km/s can be measured at two locations in the slit.
Comparing the slit with an overview image of the active region, we find that
the two observed oscillations are associated with a single loop (which crosses
the slit twice). We thus interpret the oscillations in terms of higher harmonic
fast kink waves.
Phase speeds can be measured, and coronal seismology can be performed. A strong
improvement on the determination of the magnetic field is found due to the use
of line ratios for determining the coronal density.